var sdui={
	polyarr:['p1','p2'],
	op:[1,-1] , 
};

//sdui.polyarr=['p1','p2','p3'];
function main() {



	let ds=pe.NewDataset(1,256,256,1,200);
	let ds2={};

	for( var i=0;i<sdui.polyarr.length;++i) {
		fname = sdui.polyarr[i].p + ".geojson" ;
		ds2=ds2.clip3(fname,0);
	}
	
	return ds2;
}